From the release:
Every party of adventurers travels through marshland at some point. The Marshland geomorphic set from Heroic Maps contains 12 10x10 battlemaps that can be arranged in thousands of combinations to make unique and exciting marsh, bog, swamp and fenland maps.
Marshland is a printable battlemap compatible with any RPG/Dungeon-Crawl game. It can be used as a standalone gameboard, or combined with any same-scale tileset.
Marshland is a geomorphic set, comprising 12 10x10 square battlemaps which can be arranged in multiple layouts. The set includes features such as rocky outcrops, pools, dead trees, vegetation and swampy ground.
Also included is a set of 300dpi full size jpgs, for poster printing or VTT, in both gridded and non-gridded versions. (n.b. gridless version only available as full jpeg).